Our subscription plans come with a limit of 100 testers per test max. Beyond that number, we've found that bug submissions and survey feedback tends to get repetitive.
You can select the number of testers you want when you design your test, and our ability to fill your test is based on the demographic criteria you select, how narrow your screening questions are, and how compelling your test process and incentives are for our testers.
We generally recommend a smaller audience (less than 25) for quick feedback, video-based tests, or quick QA tests.
For larger beta tests and more user research driven needs, 50-100 people is ideal to get quantitative data that is meaningful.